Management goals for restoring populations of the federally-threatened northern spotted owl currently include experimental lethal removals of barred owls from demographic study areas within the overlapping ranges of the two species to examine northern spotted owl population response. As lethal removals of a bird species are time- and cost-intensive, predictive...
To assist with risk-assessment with deepwater and ultra-deepwater prospects for offshore energy extraction as well as provide a useful tool for oil spill response, a spatially-explicit model was developed for comprehensive simulations of a blowout event from the wellhead to final fate and degradation. The Blowout and Spill Occurrence Model...
The role of weather in influencing tourist-recreation visitation
to the Oregon coast during the six-month summer season of May
through October has been investigated by this research. In addition,
the normal day-to-day fluctuations in coastal visitation has been
determined.
Based upon the normal visitation, the tourist-recreation season
on Oregon's coast...
The known distribution of beluga whales ranges from sub-Arctic to Arctic waters where they migrate in pods in response to environmental factors such as the presence of sea ice and prey. This study uses bivariate and multivariate analysis techniques to measure how environmental covariates are associated with the spatial-temporal distribution...
Little information is available on northern barred owl (Strix varia
varia) life history in the Pacific Northwest but their invasion into northern spotted owl
habitat (Strix occidentalis caurina) appears to be significant and detrimental to
conservation of the latter species. Forest fragmentation has been suggested as a possible
factor in...
Invasion by exotic species can pose a major challenge for developing native
plant communities in wetland restoration projects. Often native plant communities
do not develop as anticipated in restored wetlands due to colonization by exotic
species that dominate the native plant community. Despite the time and expense to
restore wetlands,...
Due to recent changes in Oregon land-use regulations, agricultural
resource lands within exclusive farm-use zones are being designated
as high-value, important, or small-scale farmland according to their
relative potential for commercial agriculture. Potential gross
agricultural sales are used as a threshold in the designation of
small-scale farmlands; however, the regulations...
Sea tide heights predicted one year
in advance are manipulated to give accelerations
in centimeters per second per kilometer for the
distances San Francisco to Humboldt Bay and
Humboldt Bay to Astoria. Comparison of these
accelerations to various earth-moon-sun lineups
shows the accelerations are controlled by the
29.53 day lunar...
A statistical analysis of extreme chinooks in Montana as they
relate to large scale atmospheric circulation changes is the subject
of this thesis.
A mean chinook situation was identified which indicated that a
critical pattern of the surface flow always contained a Polar or
Arctic airmass which overspread the prairie...